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" ... We were studying how anticancer drugs affected the mitochondria, the Russet potato-shaped energy powerhouse of the cell. When DNP was added to the mitochondria, they went kaput, unable to use oxygen to make ATP, the biochemical currency of life. Scientifically, we were using DNP as a positive control substance to show that our isolated mitochondria were using oxygen by a process you may remember from high school biology called oxidative phosphorylation. ... "